Automatic pressure-limiting valve.



0. E. OLESON.

AUTOMATIC PRESSURE LIMITING VALVE.

APPucATloN min IAN. 2,1913.

,228,593. PatentedJune 5, 1917.

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. 22214 mm@ @www 50. it is necessary to provide `valves in the pipesUNITED STATES Pfulitivl? OFFICE;

OLAF OLESON, 0F CHICAGO,` ILLINOIS, ASSIGNOR TO THE EDWARD STEAMSPECIALTY CO., OF CHICAGO', ILLINOIS, A CORPORATION OF ILLINOIS.

AUTOMATIC PRESSURE-LIMITING VALVE.

'To all whom t may concern:

cago', in the county of Cook/and State of Illinois, have invented acertain new and useful Improvement in Automatic Pressure- LimitinolValves, of which the following is a full, lear, concise, and exactdescription, reference being had to the accompanying drawings, forming apart of this specification.

My invention relates to-an improved construction o'f pressure limitingvalve by which when for any reason the difference in pressure betweenthe supply and delivery ends of the valve reaches a predeterminedamount, the valve is automatically moved to its seat to prevent theescape of the fluid, the flow of which is controlled by the valve. Afurther object of my invention is to provide in connection with astructure of the kind referred to a. stop mechanism which willpositively hold the valve against its seat.

A further object of my invention is to 'provide a valve construction ofthe kind referred to which. will automatically operate to stop the flowof iiuid'through the valve for a drop in pressure at either end of thevalve a ,predetermined amount below the pressure at thel other end ofythe valve It is a further object of my invention to' provide inconnection with valves of the kindl just referred to, auxiliary valvemechanism by which the pressures at the two ends of the pressurelimiting valve ma be equalized to permit the automatic va ve mechanismto return to its ,normal open position.

While valves of the kind described may be employed for many purposes, asfor example, the handling'of gas of any description, steam under highpressure, or coinpresssed air, they are of particular value inconnection with the use of compressed air as the motive power in mineswherel long lines of pipe are run between successive storage reservoirsfor 4the purpose of containin air under high ressures. As'a result o thegrade of la or employed, accidents easily occur to these pipe systemsand which will normally not interfere with the 'low of the air throughthem but as soon as there is a break,- the valves must operate toprevent a serious loss of air pressure in the Specification of'Lettex'sPatent.

ratendfaune 5, 1917.

Application led January 2, 1913. Serial No. 789,896.

remainder of the system. In systems of this kind it is necessary toprotect either one of two adjacent reservoirs from serious. loss' b ymeans of a valve or valves in the main line and my double action type ofpressure limiting valveserves'this purpose since it p rotects'the lineand pressure reservoirs for either direction o'f undue drop in pressurethroughthe valve. When, as a result of an accident, one of the valvesthus placed has been operated and the break in the line has beenrepaired, the by-pass valve mechanism contained in the main valve'casing operates to quicklyV restore the two sides of the. main valve tothe same pressure so that-the auto- 1 matic valve mechanism is returnedto its tem of the kind under consideration, it

isv necessary to have protection only in one direction and tliis singleacting valves constructed in' Vaccordance with my invention aresuiicient to afford this result. Both the single acting and doubleacting valves, however, are similarl made in many respects which, as faras am aware, are novel.

The several drawings illustrating my in'- vention are as follows:

. Figure 1 shows in centrallongitudinal section my valve construction;

Fig. 2 is a transverse central section of the valve casing shown in Fig.1 showing the mounting in the ,casing of the by-pass valve mechanism;

tanks equipped with valves of the construction herein described.

Similar numerals refer to similar parts throughout the several views.

atA

Fig. 3 shows a pipe line and pressureY As shown in Fig. 1, the valvecasing 1 is provided with an inlet opening 2 and an outlet opening 3which communicate through an aperturcd horizontal wall 4 in the body ofthe valve, which wall has threaded into its aperture a` valve seat 5.The valve seat is adapted to coperate with a valve 6 which has extendingaxially from its rear surface a cylindrical spider 7 for guiding thevalve 6 by engagement with the tubular bushing 8 rigidly secured in atubular flange 9 projecting into the valve casing from the cover 10 ofthe valve. The cover 10 is threaded to receive a threaded stem 11operated by means of a hand wheel by. an adjusting. screw 17' whichextends through theend wall 33 formed across the seat whenv desired.-The stem 11. outside of the threaded portion where it passesthrough thecover 10 is packed in a manner 'wellv known in theart, as a result ofwhich it is not here particularly described.

rll'he valve 6 has projecting axially 'romfk its vfront face through theaperture in the valve seat 5 a stem 13 ternnnating 1n an enlarged diskor head 14 against the under face .of which one en d of a spring 15rests. The .central portion of the disk 14is conformed vto engage theinside of the upper coil of the spring 15 to prevent lateral dis#placement of theI spi'i'ng relatively to the same. The lower end of thespring 15 rests upon a plate 16, also provided with a cylindricalextension to prevent lateral displacement of1 the spring 15.

The joint between the valve cap or cover 10 and the body portion 1., ismade perfectly tight by meansof an annular flange 23 of l-shapedcross-section, which extends from the under face of the cover, saidflange being grooved as indicated so that when it is forced intoepgagement with the V-shaped vgroove formed in the outer face of thevalve lcasing 1 to receive it, the reduced rings thus formed on theflange 23 yield so as to make a perfectly tight joint with the bodyportion 1. Similar joints are formed on the end anges 24 and 25 of thevalve casing so as to make tight joints with the section of pipe towhich the valve mechanism is connected.

.The p'late 16 is engaged on its outer face lower end of the tubular'extension 34 formed on the valve 32, which valve coperates with thelower end of the-valve seat '5. The valve 32, tubularvv extension 34 andend wall 33thus together constitute both a valve l.for interruptingcommunication between the two passages of the valve body 1 and thereceptacle forthe spring 15 and its cooperating parts.. The outer faceof the valve 32 rests against the inner end'of the vscrew plug 35 whichis .bored so as to form l a loose itfor the tubular extension 34. Theinner wall ofthe screw plug 35 is provided with grooves 36 to securerestricted communication between the passage, 3 and the compartmentformed within the screw 'cover 37 4which is screwed on to the screw.plug35 to surround -and protect the adjusting .screw 17. The screw plug35 is'sci'ewed into the valve casing 1 so as to hold'the spring 15 inline with the valve stem 13 and the operating stem. Holes 38 are drilledthrough the disk 14 to provide a desired 4 degree of communicationbetween the' passage 3 and the inside of the tubular extension 34. Thevalve 6 is preferably provided with avent passage 21 masses .I and thevalve casing lis preferably provided with anauxiliarylby-pass valve 26as shown in-Fig.'2.

rIhe o eration of the mechanism is as follows: hen :the pressure in thepassage 3 ldrops belowthe pressure in the passage2 'by an amountslightly in excess of that for l which the spring 15 is set, thepressure on `the vrear or outer `face of the valve v6 causes the Valveto move into engagement with its seat against the action of the spring15.

vFor this operation, the holes 38 aord a sulicient relief for the aircontained in the tubular extension 34 so that the desired cushioningeffect is secured. When for any reason the pressure in the passage 2drops below the pressure in the passage 3 by an amount somewhat inexcess of that for which the spring 15 isset, the fluid in the cap 37,having at the instant an excess pressure over the pressure in thepassage 2, moves the valve 32 upwardly as shown in Fig. 1 against ltheaction of the spring 15, Jfor which operation the holes 38 afford asuitable relieil to the fluid contained in the tubular extension 34 sothat the closing of the valve 32 will take place eiiectively and yetnottoo violently. As the valve 32 moves toward' its seat 5' it will beunderstood that the dierence between the pressures in the passages 2 and3 is increased and that therefore, when the valve is brought intoContact with its seat it is securely. held there by the pressure in thepassage 3. When the valve 6 is against its seat 5, it may be heldin,closed position byl means of the operating stem: `11. Wheny the `causefor the diilerence in pressure has been removed and it is desired toopen 'the valve 6, since the pressure in the.- passage 3 vis stillsufliciently below that in the passage I2 to hold the valve 6 in itsclosed position,

izing the pressure in the passages2 and 3. This may be accomplished bymeans of the vent passage 21 whichis opened immediatelyV upon screwingback .the operating stem from engagement with the valve 6. For this po-A. it is necessary to provide a means for equalj sition of the operatingstem, pressure in the passage 2 finds-its way through the vent 21 andthelateral opening 22 and-the pressure.

in the passage 3 is gradually built Aup so that it nearly equals thepressure in the passage 2 and a'ssoon as the diii'ercnce between thesepressures is within the value for which the spring 15 is set, the springserve s to open the valve 6 and permits free.

communication Abetween the passages 2 and 3. For certain condltions ofoperation it is found thatv a more rapid equalization of valve seat 27so that whenv closed, comv munication is interrupted between the ports 429 which are located below and above the sure limiting valve seat 27respectively, or to interrupt such communication as desired. As aresult, when the valve casing 1 is equipped with y,this auxiliary valvemechanism and it is desired to equalize the pressures in the passages 2and' 3, the hand wheel 31.

is operated to raise the valve 26 to estab-g lisli communication betweenthe ports 28 and 29, for which condition in a very short time thepressure is built up in the passage 3 to a point sufficiently near thepressure in the passage 2 so that -the valve 6 is opened by Athe spring15. The valve 26 is held in closed position against the seat 27 by meansof the operating stem 30 during the normal operation of the rest of thevalve mechanism.

In Fig. 3 I have shown somewhat diagrammatically a pressure system suchas is sometimes lused for operating tools in mines by means ofcompressed air in which valves of the kind described above areparticularly effective. In this figure the supply pipe 39 forming a partof the main pipe line'connects with a storage reservoii` 40 and alsothrough aV valve 1 with the reservoir '41. Between the storage reservoir40 and the valve 1- a branch pipe 42 is connected,| which is'providedwith a presvalve 1. The valve 1 is preferably` of t e construction shownand described in connection with Fig. 1 wliile the valve 1 may besimilar, but of the single acting type since the branch pipe 42 does notnormally serve to supply the permanent reservoir with air underpressure. On the other hand, the reservoirs 40 and 41 are frequently ofconsiderable capacity so that it is very desirableto prevent undue loss.from either one in the event of injury to the other one or to thepiping immediately adjacent 'to it. Any injury that might occur to thebranch pipe 42 outside of the pressure limiting valve 1 is taken care,of by the valve 1 of the single acting type and protection in eitherdirection in the main pipeline -39 is secured by a valve of the doubleacting type asindicated at 1. It would, of course, be evident that asmany of the valves 1a may be employed in the' main line 39 as is desiredin, order that the system may be amply protected.

While I have shown my invention in the particular embodiments hereindescribed and shown, I do not limit myself to these constructions, butdesire to claim any equivalents that may suggest themselves to thosevskilled in the art.

What I claim is: l. In a valve construction, the combination of a housinhaving an aperture ex- Ateiidiiig'through it, a valve seat located' insaid aperture, a valve copcrating with said- Aseat to control the flowof fluid through said' aperture, a stem extending from said valvetransversely ofthe main direction of said aperture, a spring engagingsaid stem and tending to hold the valve away from` its seat, a screw forchanging the tension on said spring,a second valve seat disposed in thehousing in opposite relation to the' irst valve seat, a bushingsurrounding said spring and having a second valve formed on its innerend for engaging said second valve seat, said bushing being slidablymounted in the housing and serving to slipport said screw, there beingrestricted passa'eways from the said aperture along the si es of saidbushing to its outer end, and a .cap inclosing the outer end of saidbushing and screw.

2. In a valve construction, the combination of a housing having anaperture extending through it, a valve seat located in said aperture, avalve coperating with said seat to control the low' of fluid throughsaidaperture, a stem extendin from said valve transversely ofthe maindirection of said aperture, a s ringienga ing said stem and tending toold the vzve away from its seat, a screw for changing the tension onsaid spring, a secon `valve seat disposed in the housing in oppositerelation to the first valve seat a bushing surrounding said spring andhavingv a second valve formed on its inner end for engaging said secondvalve seat, said bushing being slidably mounted in the 'housing andserving to support said screw, there being restrictcd passageways fromthe said 'aperture along ,the sides of said bushing to its outer end,and a cap inclosing the .outer end of said bushing and screw, saidbushing being mounted in a plug threaded into said housing.

3. In a valve construction, the combina-- tion 'of a housin having anaperture extending through it, a valve seat located in said aperture, avalve coperating with said y l seat to control the flow of fluid throughsaid aperture, a stem extending from said valve transversely of the maindirection of said aperture, a spring engaging said stem and tending tohold the valve away from its seat, a screw for changing the tension onsaid spring, a second valve seat disposed in the housing in oppositerelation to the first valve seat, a bushing surrounding said spring andhaving a second valve formed onits inner end for engaging said secondvalve seat, said bushing being slidably mounted in/ the housing andserving to support said screw, there being restricted passageways fromthe said aperture along the sides of said bushing to its outer end, acap inclosing the outer end of said bushing and screw, and a threadedvalve stem for hold- 4ing the first named valve against itsseat.

4f. In a valve construction, the 'cunlbina'-v tion of a housing having.an aperture eri-. tending through'it, a valve seat locatedin saidaperture, a valve' coperating with said seat to control the How of uidthrough said aperture, a stem extending from said valve transversely ofthe main direction of said `aperture, a spring' engaging said'stem and.tending to hold the valve away from its seat,

a screw for changing the tension on said spring, a second valve seatdisposed in the housing in opposite relation to the first valve seat, abushing surrounding'said spring and having a second valve formed on itsinner end 'for engaging said second valve seat, said bushing beingslidably mounted in the housing and serving to support said screw,ythere being restricted passageways from the said aperture along thesides of said bushing to its outer end, and a cap inclosing the outerend of said bushing and screw, there being an aperture of-sinall borecommunieating with opposite sides of one of said valve seats.v v

5. In a valve, the combination of a casing having a passage permittingthe liow therethrough of fluid un'der pressure, two valve seats in saidpassage, two valves, one for engaging each seat, whereby one valvechecks the flow in one direction and the other valve checks the flow intheopposite direction through said passage, a stem extending from oneside of one of said valves, a tubular extension projecting from theother valve in the saine direction as said stem, anda spring in saidtubular extension engaging said eX- tensio'n and said st em, said casinghaving a bore for containing said tubularextension,

6. In a valve, the combination of a casing having a passage permittingthe ow therethrough of fluid under pressure, two valve seats in saidpassage twovalves, onev for engaging each seat, whereby one valve checksthe flow in one directionl and the other valve checks the flow in theopposite direci tion through said passage, a stem extending from oneside of one o f said valves, a tubular extension proJecting from theother valve in the same direction as said stem,

and a vspring in said tubular extension en'- vgaging said extension andsaid stem, said casing having a bore for containing said tubularextension and forming'a receptaclefor fluid under pressure around theouter end of said tubular extension.

l 7. In azvalve, the combination of a casing having a passage permittingthe flow therethrough of fluid under pressure, two valve tubularextension, an

Leashes 'seats inl said passage, two valves, one for engaging each seat,whereby one valve checks the iow in one direction andthe otherl valvechecks the How inthe opposite direction through said passage, a stemextendin from one side of one of said valves,

a tubu ar extension projecting from. the

other valve in the same direction as said stein, a spring'in saidtubularextensionengaging said extension and said stein, said casinghaving a bore for containing said tubular extension, and a screw throughthe outer end, of said tubular extension, for chan ing the tension ofsaid spring.

8. n a valve, the combination of a casing havingA a passage permittingthe flow therethrough of lluid under pressure, two.A

valve seats in said passage, two valves, one for engaging each seat,whereby Ionev valve checks the flow in one direction and the other valvechecks the flow' in the opposite direction through said assage a sternextendin from one side o one of said valves, a tubu ar extensionprojecting fromy the other valve in the same direction'as said stem, aspring in. said tubular extension en gaging said extension and saidstern,y said casing having a bore for containing said tubular extension,and a disk on the outer end of said'stein loosely fitting said tubularexl tension. I

9. In -a valve; the combination of a casing having a passage permitting.the low therethrough of Huidunder pressure, two

valve seats in said passage, two valves, one for engaging each seat,whereby one. valve checks the flow in one direction and theother valvechecks the flow in the opposite direction through said passage, avstem'extending from one side of one of said valves, a tubular extensionprojecting from the other valve in the same direction 'as said cstein, aspring in said tubular extension en-y gaging said extension and saidstem, said casing having a bore for containing said tu-v bularextension, and devices for positively`I holdingone of said valvesagainst its seat.

10. VIn a valve, the combination of acas-l ing having a passagelpermitting the flow therethrough of fluid 'under pressure, two

valve seats in said passage, two valves, one' 11. Ina valve, thecombination lof `a cas- 1,30

` ing having a passage permitting the low therethrough of fluid underpressure, two valve seats in said passage, two valves, one for engagineach seat, whereby one valve cheeksA the Ilow in one direction and theother valve checks the flow in the opposite direction through Vsaidpassage, a stern exytending from one side of one of said valves,

a tubular extension projecting from the other valve in the samedirection as said stem, a spring in lsaid tubular extension engagingsaid extension and said stem, said easing having a bore for containingsaid tubular extension, and a threaded rod for engagingthe other sideof-said first valve to positively hold it against its seat, said firstvalve having a vent therethrough closed by said rod when it engages saidvalve. v

12. In a valve, the combination of a cass ing having a passagepermitting the flow therethrough of-f1uid under pressure, two valveseats in saidpassage, two valves, one for engaginigf` each seat, wherebyone valve checks the flow in one direction and the other valve checksthe flow in the opposite direction through said passage, a stemextending from one side of one of said valves,

a tubular extension projecting .from thev other valve in the samedirection as said stem, and a spring insaid tubular extension engagingsaid extension and said stem, said casing having a bore for containingsaid tubular extension and formin a receptacle for Huid under pressurearoun the outer end of said tubular extension, there i being restrictedpassageways alon the outer wall of lsaid tubular extension etween saidreceptaele and the passage through said casing.

In witness whereof, I hereunto subscribe my name this 14th day ofOctober, A. D.,

OLAF E. OLESON. Witnesses s ALBERT C. BELL, CLIFFORD C. DE WEEs.

